That is 100% untrue. Rats and snakes are the complete opposite. A snake isn't that smart to know that. With a rat if you get bit and pull your hand then the rat picks up on that if it bites you, you go away, that's why people kill rats when they get bit. Please do not say something if you are not 100% of it being true. Not trying to be rude or anything, but somebody had to say it.
EDIT:
I do agree that the bites from a baby ball won't hurt, you honestly won't even feel it, the shock of it happening is what scares most people.